To configure VLANs from the CLI, execute the following commands:
vlan 1 vlan 100 interface GigabitEthernet 1/1 switchport access vlan 100 switchport trunk native vlan 100 switchport trunk allowed vlan 1,100 switchport trunk vlan tag native switchport mode trunk exit interface GigabitEthernet 1/2 switchport access vlan 100 switchport trunk native vlan 100 switchport trunk allowed vlan 1,100 switchport trunk vlan tag native switchport mode trunk exit interface GigabitEthernet 1/7 switchport access vlan 100 switchport trunk native vlan 100 switchport trunk allowed vlan 1,100 switchport mode trunk exit